<template>
  <header class="header">
    <h1>todos</h1>
    <input v-model="isAll" id="toggle-all" class="toggle-all" type="checkbox" >
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      v-model.trim="taskName"
      @keydown.enter="enterDown"
    />
  </header>
</template>

<script>
export default {
  props: ['list'],
  data() {
    return {
      taskName: ''
    }
  },
  methods: {
    enterDown() {
      if(this.taskName.length == 0) return alert('内容不能为空')
      this.$emit('addTask',this.taskName)
      this.taskName = ''
    }
  },
  computed: {
    isAll: {
      set(val) {
        this.list.forEach(item => item.isDone = val)
      },
      get() {
        if(this.list.length === 0) return false
        return this.list.every(item => item.isDone === true)
      }
    }
  }
}
</script>